Stabilization of tetra alkyl lead and compositions containing the same



Patented. Dec. 8, 1931 ran STATES PATENT 01 105:

WILLIAM s. CALGOTT, or .PENNS onovn, AND ALFRED E. PARMELEE, or cAmvEYs rom'r, NEW JERSEY.

STABILIZATION OF TETRA ALKYL LEAD AND COMPOSITIONS CONTAINING THE SAME No Drawing.

This invention relates to the stabilization of tetra alkyl lead, free from other materials except normal impurities, and to the stabilization of tetra alkyl lead compositions containing hydrocarbons and halogen derivatives of hydrocarbons. More particularly our invention relates to the stabilization of tetra alkyl lead and compositions containing tetra alkyl lead by the addition thereto of small amounts of alkylol amines or derivatives of alkylol amines, and especially ethanol amines and mixtures thereof.

As pointed out in U. S. Patent 1,724,640, commercial tetra alkyl lead, particularly tetra ethyl lead, ordinarily decomposes slowly on standing, resulting in the formation of a precipitate, and that this decomposition is accelerated when organic substances such as halogen derivatives of hydrocarbons are present. In that patent we have disclosed that alkylol amines and particularly methanol amines satisfactorily overcome this decomposition and stabilize the tetra alkyl lead compounds.

An object of this invention isthe stabilization of tetra alkyl lead compounds and compositions containin these compounds by incorporatin therewith butyl amines. Another object 0 our invention is the stabilization of tetra alkyl lead com ounds by incorporatin therewith derivatives of butyl amines. Oiier objects will appear hereinafter. I

In order to illustrate the effectiveness ofcompounds of this type as stabilizers, the following examples are presented showing results of typical cases. It is to be understood however that applicants are not to be limited to the particular conditions or proportions 0 mation of insoluble precipitate.

Application filed November 6, 1929. Serial No. 405,277.

Example 2.100 grams of tetra ethyl lead, 90 grams of ethylene dibromide, 10 grams of mono-chlor-naphthalene and 0.4 gram of a mixture consisting mainly of triand diethanol amine are mixed together.

Example 51-50 grams of tetra ethyl lead are mixed with 0.025 gram of dibutyl amine.

Example .{.-100 grams of tetra ethyl lead are mixed with 90 grams of ethylene dibromide and 0.1 gram of a mixture of butyl or amyl amines. It will be understood, of course, that either tetra ethyl lead or tetra methyl lead may be 7 included in any one of the foregoing illustratlve examples. We have found that these solutlons so prepared will remain stable in definitely under the conditions ordinarily employed for the storage of tetra alkyl lead compounds and the compositions containing these compounds.

The alkyl amines, in general, either mono-, di-, or tri, and normal and branched chain, are effective for the stabilization of tetra ethyl lead. Methyl and ethyl amines are effective but because of their volatility are of less value than the higher boiling amines. The propyl amines are good but we prefer the amyl and butyl amines, and particularly di-- butyl amine or a mixture of butyl amines in which dibutyl amine predominates.

The alkylol amines, mono-, di-, or tri, are also effective such for example as the methanol, ethanol, propanol amines, etc. Of these we prefer the ethanol amines, and in particular triethanol amine or a mixture of ethanol amines in which triethanol amine predominates.

As many apparently widely different embodiments of this invention may be made without departing from the spirit thereof, it is to be understood that we do not limit ourselves to the foregoing examples or 'descriptions except as indicated in the following atent claims.

e claim:

1. A vcomposition comprising tetra alkyl lead, an alkyl bromide, and dibutyl amine. 2. A composition comprising tetra alkyl lead, a chlorinated aromatic hydrocarbon, and dibutyl amine.

3. A composition comprising tetra alkyl lead, a chlor-naphthalene, and dibutyl amine.

4:. A composition comprising tetra, ethyl lead, ethylene dibromide, a chlorinated aromatic hydrocarbon, and dibutyl amine.

5. A composition comprising tetra ethyl lead, ethylene dibromide, mono-chlor-naphthalene, and dibutyl amine.

6. A composition comprising tetra alkyl lead and a mixture of butyl amines containin dibutyl amine.

A composition comprising tetra alkyl lead, an alkyl bromide, and a mixture of butyl amines containing dibutyl amine.

8. A composition comprising tetra alkyl lead, a chlorinated aromatic hydrocarbon, and a mixture of butyl amines containing dibutyl amine.

9. A composition comprising tetra alkyl lead, a chlor-naphthalene and a mixture of butyl amines containing dibutyl amine.

10. A composition comprising tetra alkyl lead, a chlorinated aromatic hydrocarbon, and a mixture of butyl amines containing dibutyl amine.

11. A composition comprising tetra alkyl lead, a mono-chlor-naphthalene, and a mixture of butyl amines containing dibutyl amine.

In testimony whereof we afiix our signatures.

WILLIAM s. CALGOTT. ALFRED E. PARMELEE.

CERTIFICATE or CORRECTION.

Patent No. 1,835,141. Granted December 8, 1931, to

wane-.1 5. QLCOTT 22 1 Panama It is hereby certified that the above numbered patent was erroneously issued to the inventors, said "Galcott and Pal-melee, whereas said patent should have been issued to E. I. du Pont de Nemours 8: Company, of Wilmington, Delaware,

a corporation of Delaware, as assignee of the entire interest in said invention, as shown by the records of assignments in this office; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 9th day of February, A. D. 1932.

M. J. Moore.

(Seal) i Acting Qommissioner of Patents. 

